Detection of pulsed X-ray emission from the binary millisecond pulsar PSR J0218+4232

Details Detection of pulsed X-ray emission from the binary millisecond pulsar PSR J0218+4232 Detection of pulsed X-ray emission from the binary millisecond pulsar PSR J0218+4232

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336..545k&link_type=abstract

Astronomy and Astrophysics, v.336, p.545-552 (1998)

Astronomy and Astrophysics

Astrophysics

21

Pulsars: Individual: Psr J0218+4232, Psr B1821-24, Stars: Neutron, X-Rays: Stars

Scientific paper

We report the detection of pulsed X-ray emission from the binary millisecond pulsar PSR J0218+4232 in a 100 ks ROSAT HRI observation. The lightcurve deviates from a flat distribution at a ~ 4.8sigma level, showing a sharp main pulse with a duty cycle of ~ 0.15\ (350mu s), compatible with smearing due to the scatter in the ROSAT clock calibration. The intrinsic width can be smaller than 100mu s. There is an indication for a second peak at a phase separation of 0.47+/-0.01. The pulsed fraction is 37 +/- 13%. No indication for a modulation at the orbital period of the binary system is found. This is the fourth millisecond pulsar showing modulation in X-rays at the radio-pulsar period. The sharp pulses, very similar to those of PSR B1821-24 and the Crab pulsar, point to a magnetospheric origin of the pulsed X-ray emission. The observed and derived parameters of PSR J0218+4232 and PSR B1821-24 are very consistent with the exception of the small pulsed fraction of PSR J0218+4232. The large unpulsed component in X-rays and that reported earlier in the radio domain can be explained by emission from a compact nebula with diameter ~ 14''.

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